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arXiv · 1003.5039

Strong carrier-scattering in iron-pnictide superconductors with highest Tc obtained from charge transport experiments

S. Ishida·M. Nakajima·Y. Tomioka·T. Ito·K. Miyazawa·H. Kito·C. H. Lee·M. Ishikado·S. Shamoto·A. Iyo·H. Eisaki·K. M. Kojima·S. Uchida
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Abstract

Characteristic normal-state charge transport is found in the oxygen-deficient iron-arsenides LnFeAsO1-y (Ln: La and Nd) with the highest Tc's among known Fe-based superconductors. The effect of "doping" in this system is mainly on the carrier scattering, quite distinct from that in high-Tc cuprates. In the superconducting regime of the La system with maximum Tc = 28 K, the low-temperature resistivity is dominated by a T^2 term. On the other hand, in the Nd system with Tc higher than 40 K, the carriers are subject to stronger scattering showing T-linear resistivity and small magnetoresistance. Such strong scattering appears crucial for high-Tc superconductivity in the iron-based system.

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S. Ishida, M. Nakajima, Y. Tomioka, T. Ito, K. Miyazawa, H. Kito, C. H. Lee, M. Ishikado, S. Shamoto, A. Iyo, H. Eisaki, K. M. Kojima, S. Uchida. 2010-03-26. Strong carrier-scattering in iron-pnictide superconductors with highest Tc obtained from charge transport experiments. https://doi.org/10.1103/physrevb.81.094515

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